Pressure filter



May 7, 1935. B. KELLEY '2,000,137

PRESSURE VFILTER Filed Aug. 19, 1931 5 Sheets-Sheet l W FQ I u u e o n o a e a on a a s a o u u o n a au e o u u n u e l u en May 7, 1935. B. KELLEY PRESSURE FILTER Filed Aug. 19, 1931 May 7, '1935. B, KEN- EY 2,000,137

PRESSURE FILTER Filed Aug. 19, 1931 3 Sheets-Sheet4 5 /2'2 V w o l o '75 l 70 i i I 76 I `el y I t ya ,l 'l I6 A 1 *i 76 v l y l 0 I l I 6 lill-S l 10 gewenste@ mentes Mey 1, 193s UNITED ISTATES PATENT ori-ice This invention relat'estoaertain new and useful improvements in pressure nlters.

While the pressure filter disclosed herein may be used in various industries and arts, the same is primarily intended for use in the dry cleaning industry and an object thereof is to clean the fluid bag solvent, such as gasoline, for the removal of dirt.

lint, and other foreign mattertherefrom, to return the solvent to the cleaning or washing apparatus' in a crystal clear condition.

A further object of ,the invention is to provide a pressure filter wherein a filtertank is in .valve controlled pipe communication with washing apparatus, with a fabric filter basket removably mounted in the filter receptacle with the nlter basket o f cylindrical formation, opened -at its upper endy and closed at its lower end and telescopically folded with the side walls thereof spaced from each other to increase the percolating or straining areas of a relatively larger filter balrsetl in a restricted area to obtain maximum ill-'- tration of the solvent.

A further and important object ofthe inven- `tion, is to discharge the dirty solvent into the .o filter basket tangentially to causethe same to be moved in a. swirling circular path for even distribution on the surfaces 'of the fllter bag of the foreign matter and cleaning powder usually added to the solvent for the even formation of a coacting or cake on the walls of the illter bag so that the solvent escapes through gthe bag over theentire `areajthereofin a crystal clear condition forreturning to the washing apparatus, the cake formation being of a porous character permitting the ilow of solvent therethrough with the results that pressure is extremely slow in building up inthe filter receptacle so that the operator may wait for a longer period of time without loss of time in frequent change or cleaning of the bag.

Another object of the invention is to provide a pressure filter wherein-thevsolvent to be cleaned or filtered is delivered to a tank or receptacle in a manner'to create a swirling motion in the receptacle with means intercepting the outlets from the receptacle to delete'foreign matter from the solvent so thattthe latter issues from the receptacle in a crystal clear condition.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists in the I novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

v In the accompanying drawings:

Figure 1 isola fragmentary side elevational view.

in extended position, Y

"wrench device for removing the partly in vertical longitudinal'sections. of a dry cleaning systemwith a pressure iilter in 'communication with'washing apparatus.

Figure 2 shows a side elevational view of the screen container and cover that houses a Afilter 5 Figure 3 isa horilontal sectional view ofthe screen container, g Y Figure 4 isla perspective view of the nlte'r bagf Figure 5 is a perspective view on a. reduced scale of the filter bag. with a device illustrated therein bydotted linestocausethebagtoassumeatelef scopic folded position when placed in the screen container, J 1

Figure 6 is a perspective view of the filter bag-inv foldedltelescopic position,

Figure 7 is a vertical longitudinal sectional view of another form of pressure filter showing screening trayssupported by an 'outlet pipe from the 20 filter, a

Figures is e top pian viewer the nicer shown in- A Figure 7 with cover removed,

Figure 9 is an enlarged detailed sectional view showing the screening trays supported on the outlet pipe, n Y,

Figure l0 is a detailedpsectional view taken onlinesll-llofFigure9, s .l I'

Figure ll is a side elevational view ofthe from the outlet. pipe to permit removal ofthe screening trays. 'and to bodily remove the filterl unit; and i y Figure 12 is a side elevational v lew of the cleaning tool for the Referring more in detail to the drawings and particularly to Figures 1 to 6, there isillustratedadrycleaningassemblyincluding4 a washer II and a nlter receptacle I.- The dirty solvent from the washer Ii outlets at the. lower mi end thereof through'the pipe' I1 and after passing through several cleaning stags, the saine is discharged into the receptacle Il of the pressure iilter for return to the upper end of Athe washer il 'by way of the return pipeline' Il. 45v The apparatus will be dcribed by Vfollowing the path of flow of the solvent, the solvent outletting from the bottomof the waslier II by way of the pipe I1 entering a trap Ii-with are- Y movable cover Il to facilitate the cleaning, the 50 trap il having a screen cylinder 2| therein to effect the removal of any particles of foreign matterin the solvent. Solvent from the trap Il flows Athrough the pipe l! thatcontains a sight glass 23 permitting observation of tliesol-gA 55 retaininspl so:

vent and said pipe 22 extends through a heater box 24 for breaking up any heavier particlesof foreign matter that may escape the trap I9, a heating medium for the box 24 being supplied thereto from a suitable source under the control of the valve 25 and outletting at the lower end of the box as at 26. The pipe 22 outwardly of the heater box 24 carries an angle extension 21 with a control valve 28 therein, the extension 21 being connected to a fitting 29 that has a pipe connection 38 with a compressor pump 3I. The outlet pipe 32 from the pump 3I carries an angle pipe extension 32 with a control valve 33 set therein, the pipe 32 being connected to a fitting 34 for purposes presently to be described and said fitting 34 has a pipe section 35 extending through the side walls of the filter receptacle I6 adjacent its upper end. The pipe section. 36 has a unin connection 31 with the pipe section 35 being located within the receptacle I6, the pipe section 36 carrying depending branch pipes 38 and 39 that extend downwardly into compartments of a filter bag contained in` a screening chamber housed within the receptacle I6,

The screening chamber is a cylindrical formation and comprisesan outer perforated wall 48 carried by a bottom wall 4I provided with feet 42 for elevating the bottom wall of the screening chamber from the bottom wall 43 of the receptacle I6. The screening chamber has a pair of concentric spaced inwardly disposed walls 44 rising from the bottom wall 4I in spacedrelation with the outer wall 48 and are closed at their upper ends by a ring 45. The screening chamber is provided with a removable cover wall 46 retained in closed position upon the upper end of the chamber by a plurality of pivoted screw lugs 41 and the depending outlet pipes 38 and 39 are secured as at 48 to the cover 46 to bemovable with the cover when the screws 41 are released and the union'31 is operated to disconnect the p ,pipe section 36 from the pipe section 35 as illustrated in Figure 2. The`depending pipe 38 enters the central compartment of the screening chamber inwardly of the double wall construction 44 while the-depending pipe 39 enters the screening chamber between the 4outer wall 48 and the adjacent central wall 44 as illustrated .in Figures 1 and 3, lateral outlets 49 in the lower ends of the depending pipes 38 and 39 opening in opposite directions to create a swirling motion of the solvent within the screening chamber.

A filter bag is adapted to be placed in the screen chamber in a telescopic folded condition 'as illustrated in Figure 1, the bag y58 shown lin Figures 4 to 6 carrying a ring flange 5I at its pen end to be supported upon the upper end of the screening chamber and retained in position by the chamber cover 46, the sides being telescopically folded with the aid of theform or weight device 52 shown in Figure5 into the positions shown in Figures 1 and 6, the lower end of the bag 58 being received in the central compartment of the screening chamber inwardly of the double -walls 44 while the telescopic fold depends into the annular space of the screening chamber between .the wall 48 and the adjacent double wall 44, the inner section of the bag being shown at 58* and the double fold portion at 58b in Figure 1, the depending pipe 38 enter'- ing the .central portion of the bag while the depending pipe 39 is positioned between the double folds 58h. When the bag is completely positioned within the screening chamber, the form 52 is removed from the inner closed end of the bag 58 and the cover 46 for the screening chamber is engaged with the upper end thereof.

In the operation of the apparatus, dirty solvent from the washer I5 outlets through the f pipe I1 at the lower end thereof and enters the screened trap I9, the solvent owing therefrom through `the pipe 22, the character thereof being observed through the sight glass 23, the solventl being heated by the heater 24 inclosing a portion of the pipe 22 before entering the pump 3| by way of the pipe sections 21 and 39. The solvent is forced by the pump 3| through the pipe sections 32 and 35 to enter the pipe section 36 supported upon the cover 46 of the screening chamber to descend downwardly through the pipes 38 and 39 into different sections of the filter bag within the screening chamber and discharged into the filter bag in a swirling circular motion by the lateral outlets 49 in the lower ends of the pipes 38 and 39. The mixture of lter powder and cleaning solvent enters the filter bag, the solvent passing through the bag and leaving a coating on the inner walls thereof known as a filter coat. Upon the formation of the filter coat, the solvent flows therethrough and enters the receptacle I6 in a clear condition. The swirling action of the mixture of nlter powder and solvent causes clirt and other foreign matter in the solvent to be evenly distributed over the walls of the bag for the formation of the filter cake that is of a porous characteristic to permit the passage of solvent therethrough. The solvent in a clean and clear condition rises in the receptacle I6 and overflows through the pipe I8 for return to the washer I5, the pipe I8 being provided with a thermometer 55 for determining the heat condition of the cleaned solvent. If desired, a portion or all of the solvent returning through the pipe I8, may be diverted to the pipe 56 onthe control of f the valve 51 for delivery to a chemical treating tank or distilling apparatus while the washer is still in operation for refreshing the solvent which is returned through the pipe I8 for discharge into the washer I5 by way of a pipe leading to the valve connection 58. As shown in Figure 1. a pressure gauge 59 is carried by the pipe 32 for determining the pressure in the filter chamber so that an operator may know when the cleaning or changing of the filter bag is neces.-

chamber, there is provided a pipe extension 68 i from the pipe 32 that has a pressure release valve 6I set therein, that is opened in the presence of pressure to permit passing of the solvent through the pipe 62 adapted to the fitting 29 for return to the pump 3I by way of the pipe 38, the pipe 62 having a sight glass 63 therein for observing the condition of the solvent. When it is` necessary to replace the filter bag with a clean one, it being understood that the bag is completely filled wit dirty solvent as the return pipe I8 is above t e screening chamber 48, a source of air supply has a pipe connection 64 with a fitting 29 on the control of the valve 65, the air entering the pump 3l to beA discharged into the bag by way of the pipes 38- and 39 for driving the solvent through the filter 38 with the solventemerging therefrom in a cleaned condition. When the bag has been completely emptied of liquid solvent and the receptacle I6 lled to the level of the returnl therefrom. The valve I6 is of a safety character to be automatically opened in the presence of excessive heat conditions or fire, the valve inthe pipe 10 attached to the tting 34 having a control valve 1| therein with the pipe 'Il attached to the pipe 22. To remove the bag il from the screening chamber, the union 31 is disengaged from the pipe section and the screw pins 41 disengaged from the cov'er 46 whereuponl the cover together with the pipe section 3i on depending pipes 3l and 3l are elevated from the screening chamber. It has been found" that the filter bag may be more easily removed from the screening chamber by placing a'ring 12 as shown in Figure 1 upon the upper ends of the double walls u between a telescopic fold of the bag. 'I'he dirty filter bag is then removed forfcleaning and replacement in a minimum of time so that the apparatus operates practically uninterruptedly. When passage of the solvent through the filter ba'g is retarded by the excess formation of the cake upon the walls of the bag,- this condition is registered by back pressure on the pressure gauge 59 and is a telltale that the bag needs cleaning or replacement. In pressure filters having a lter bag with a filter cake formed thereon, it frequently occurs that the f filter cake collapses when the illter is out of service and with the flow of solvent in a downward direction, the collapsed cake becomes packed in the bottom of the bag by the downward pressure of the solvent and such collapsed cake is lost so far as redistribution thereof for 'the reformation of a lter cake is concerned. Also, if the speed is vin a direct upward path, the reformation of a collapsed filter cake on the wallsof a bag could not be successfully accomplished as the same would be re-distributed in an uneven'and streaky manner. It is therefore ves sential that the solvent be delivered to the lower end of the filter bag in a manner to cause upward'whirling motion thereof for the initial formation of a filter cake evenly upon the walls of the filter bag and in the event of rebuilding a collapsed filter cake, the upward whirling motion of the solvent evenly redistributes the lter cake over the walls of the bag. Therefore, theV gist of this invention embodies the upward whirling motion imparted to the solvent or other uid for the formation of the filter cake on the walls of a filter bag, this upward whirling motion being particularly effective in the presence of collapsed filter cakes.

It will be understood that by introducing the polluted liquid in a substantially horizontal direction and tangentially with reference .to the walls of the liquid chamber, the liquid is thereby caused to swirl within the chamberand to move upwardly ltherein and in paths substantially parallel to the upright walls of the chamber.

The same principal of operation is embodied in the form of the invention illustrated `in Figures 7 to l2, the reference character il* indicating a receptacle having a removable cover 4i* and diametrically opposite inlet pipes 38" and 39 adjacent the lower end of the receptacle Il' with a discharged end Il* angularly directed causing a circular swirling action of the solvent discharged into the receptacle Ill. -A stand 'pipe 'I3 perpendicularly rises in the receptacle I6* to the iilter bag at a point adjacent its lower endy and has an outlet pipe "at it'slower end for the return of clean solvent to the washer. One side ofthe stand pipe '|43 is longitudinally slotted as at 'II and tribular pipe sections n slidably mounted in the stand pipe Il have angle nipples 11 projecting therefrom through the, side slots 15 of the stand pipe, the several pipe sections Il being arranged in superposed-contactlng relations and retained in the stand pipe against the movement by the screw plu'g II threaded .into the upper end of the stand pipe with a wrench end 'Il 4upon its upper end to be .engaged bythe wrench Il as shown in Figure ll. Each nipple 'I1 carries a screening tray Il having a illter screen cover I2 as shown in Figures 8 and 9, the dirty filtering through the screen i! and being delivered by the trays Il to the stand pipe- 13 and the return pipe 14. The screen Il may be cleaned by the ilexible cleaning rod Il shown in Figure 7 while'the receptacle It* ismade accessible for cleaning purposes by the manhole opening and cover 8l. A drain valve Il is pro-'- vided in the lower end of the receptacle Il* and said valve l5 may be automatically opened in the presence of excessive heat conditions or ilre by the melting of the fusible link having a chain connection Il therewith.

From the above detailed description of'the'in# -bodiments of the invention, it is to be understood that minor changes may be made therein such as will ,fall within the scope of the invention. as claimed.,

What I claim as new is:- I 1.-,In a pressure `filter of the character described, a pressure filter having supply and outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder to the filter bag at a point adjacent its lower end and in a swirling motion for the intimate mixture of matter foreign to the solvent land to cause the formation of a filter cake from the bottom upwards on the walls of the bag, the pressure fil'- ter lincluding a receptacle and a.l screen chamber in the receptacle for supporting the bag with the solvent delivering means extending downwardly between folds of the bag. 2. In a pressure filter of the character described, a pressure nlter having supply and out-4 let pipe connections, a filter bag in the filter and means for delivering solvent and filter -powder to the'illter bag at a point adjacent itslower end and in i swirling motion for the intimate mixture of matter foreign to the solvent andto cause the formation of a filter cake from the bottom upwards on the walls of the bag, the pressure 'iiltsr includinga receptacle and a screen chamber in the receptacle for supporting the bag, the screen chamber having anv outer wall and a pair of spaced concentric inner walls withthe filter bag supported by the walls with the solvent delivering means' extending downwardlyv between 'the folds of the bag. f

3. 1nv a pressure nlter of the character. de-l scribed, a pressure nlter having supply and out let pipe connections, a. lter bag in the fllteraasidmeans for delivering solvent and illter powder and in a swirling motion for the intimate mixture of matter foreign to the solvent and to cause the formation of a filter cake .from the bottom upwards on the walls ot the bag, the pressure filter including a receptacle and a screen cham- 'It 30 while' there are herein shown; the preferred ember in the receptacle for supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls, and said filter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber with the solvent delivering means extending downwardly between the folds of the bag.

4. In a pressure filter of the character described, a pressure lter having supply and outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder to the filter bag at a point adjacent its lower end and in a swirling motion for the intimate mixture of matter foreign to the solvent and to cause the formation'of a filter cake from the bottom upwards on the walls of the bag, the pressure lter including a receptacle and a screen chamber in the receptacle for supporting the bag, the screen'chamber havin an outer wall and a pair of spaced concentric er walls, and said fllter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber, with the folded walls of the bag spaced from each other with the solvent delivering means extending downwardly between the folds of the bag.

5. In a pressure filter of the character described, a pressure filter having supply and outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder toy the filter bag at a point adjacent its lower end and in a swirling motion for the intimate mixture of matter foreign to the solvent and to cause the formation of a filter cake on the walls of the bag, the pressure filter including a receptacle and a screen chamber in the receptacle for supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls with thefilter bag supported by the walls,- the solvent delivering means including a pipe extending across the upper end of the filter bag.'

discharge pipesdepending therefrom into spaces .between the folds of the bag with lateral outlets at the lower ends to promote the swirling action of the solvent.

6. In a pressure lter of the character -described, a pressure filter having supply and outlet pipe connections, a. filter bag in the filter and means for delivering solvent and filter powder to the filter bag at apoint adjacent its lower end and in', a swirling motion for the intimate mixture of matter foreign to the solvent and to cause the,

formation of a filter cake on thel walls of the bag, the pressure filter including a receptacle and a screen chamber in the receptacle for supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls, and said filter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber, the solventl delivering means including a pipe extending across the upper end of the filter bag, discharge pipes depending therefrom into spaces between the folds of the bag with lateral outlets at th'e lower ends to promote the swirling action `of the solvent. 1 i

7. In a pressure filter of the character described, a pressure filter having supply and outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder I tothe filter bag at a point adjacent its lower end and in a. swirling motion for the intimate mixture ofumatter foreign to the solvent and to cause the formation of a filter cake on the walls of the bag,

faucons?A the pressure filter including a receptacle and a .and be adjacent the outer wall of the chamber,

with the folded walls of the bag spaced from each other, the solvent delivering means including a pipe extending across the upper end of the filter bag, discharge pipes depending therefrom into spaces between the folds of the bag with lateral outlets at the lower ends to promote the swirling action of the solvent.

8. In a pressure filter of the character described, a pressure filter having supply and outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder to the filter bag at a point adjacent its lower encl` and in a swirling motionfor the intimate mixture of matter foreign to the solvent and to cause the formation of a filter cake on the walls of the bag, the pressure filter including a receptacle and a screen chamber in the receptacle for. supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls, and said filter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber, the solvent delivering means including a pipe extending across the upper end of the filter bag, discharge pipes depending therefrom into spaces between the folds of the bag with lateral outlets at the 4lower ends topromote the swirling action of the solvent, means for forcing a current of air through the screen chamber and a safety drain valve inthe lower end of the receptacle.

9. In a pressure filter of the character described, a pressure filter having supply Vand outlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder to the filter bag at a point adjacent its lower end and in a swirling motion for the intimate mixture of matter foreign to the solvent and to .cause the formation of a filter cake on the walls of the bag, the Apressure filter including a receptacle and a. screen chamber in the receptacle for supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls, and said filter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber, with the folded walls of the bag spaced from each other, the solvent delivering means including a pipe extending across the upper end of the filter bag, discharge pipes depending therefrom into spaces between the-folds of the bag with lateral outlets at the lower ends to promote the swirling action of the solvent, means for forcing. a current of air through the screen chamber and a safety drain valve in the lower end of the receptacle.

10. In a pressure filter of the character described, a,pressure filter having supply andeutlet pipe connections, a filter bag in the filter and means for delivering solvent and filter powder Y the pressure lter.

walls, and said illter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent the outer wall of the chamber, with the folded walls of the bag spaced from each other, the solvent delivering meansl including a pipe extending across the upper end of the filter bag, discharge pipes depending therefrom into spaces between the folds ,of the bag with lateral outlets at the lower ends ceptacle and a screen chamber in the receptacle for supporting the bag, the screen chamber having an outer wall and a pair of spaced concentric inner walls, and said tllter bag being telescopically folded to inclose the inner spaced walls of the screen chamber and be adjacent sthe outer wall of the chamber, with the folded wallsof the bag spaced from each other, the solvent delivering means includinga pipe extending across the upper end of the iilter bag, discharge pipes depending therefrom into spaces between the folds of the bag with lateraloutlets at the lower ends to promote. the swirling action of the solvent, a removable cover for the screen chamber and a detachable connection between the cover and cross pipe.

12. 'I'he method herein described of filtering polluted solvents used in dry cleaning apparatus and the like consisting in flowing under-pressure a uidconsisting of a mixture of liquid solvent and a non-buoyant insoluble filter-powder into an upright chamber whose upright reticulated wall is to be coated with said lter-powder, the.

mixture of solvent and filter-powder being introduced into the lower end of said chamber in a substantially horizontal direction substantially parallel to the the upright wall of the chamber to cause an upward spiral swirling movement of the intimatelyr mixed solvent'and lter-powder throughout the length and the area of the illter chamber to thereby cause the filter-powder to be evenly deposited as a filtering coating upon the entire area of the upright reticulated wall of the filter chamber and also take up and disintegrate the pieces of cake which wall from the wall and redistribute the powder upon the wall, the discharge side of the reticulated wall being kept limmersed in ltered solvent during the filtering operation.

13. A pressure iilter apparatus of the character described, a receptacle for receiving the ltered liquid, a pressure-filter proper enclosed in said receptacle, outlet means for said receptacle positioned and adapted to maintain a level of clean liquid in the receptacle at a point above said pressure-inter proper so as to maintain immersion thereof, said pressure-filter proper embodying a cylindrical foraminous casing and compartment-forming foraminous wallsl enclosed in said casing, said foraminous walls being adapted to receive and hold the filter-cake hereinafter referred to, inlet means for said pressure-filter proper extending into the lower endsof the -compartments formed by the foraminous walls and foraminous casing and arranged to deliver the liquid tangentially with respect tothe wall of the casing to thuscause an upward swirling of the mixture of cleaning liquid and suspended illter-powder throughout said compartments to thereby build up from the bottom a porous illtering wall on said foraminous walls throughout the area of said walls.

14. A pressure lter, a receptacle for iiltered solvent having an outlet, a foraminous casing in said receptacle, a filter-bag supported in said casing, and vmeans for delivering the uid to be cleaned together with a powdered suspended fllter-aid into the filter-bag at a point adjacent its lower end and in a direction tangential to the wall of the bag to thus cause a swirling motion of the mixture upwardly within the entire area of the filter-bag whereby the filter-aid is uniformly deposited in the form of a filter-cake upon the -wall of the iilter-bag throughout the area thereof and whereby also any -displaced pieces of the lter-cake will be disintegrated and redistributed and redepositedupon the wall of the lter-bag.

BLJNE KELLEY. 

